
<!DOCTYPE HTML>
<html lang="zh-hans" >
    <head>
        <meta charset="UTF-8">
        <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
        <title>正则表达式 · JavaScript学习</title>
        <meta http-equiv="X-UA-Compatible" content="IE=edge" />
        <meta name="description" content="">
        <meta name="generator" content="GitBook 3.2.3">
        <meta name="author" content="Veng">
        
        
    
    <link rel="stylesheet" href="../gitbook/style.css">

    
            
                
                <link rel="stylesheet" href="../gitbook/gitbook-plugin-pageview-count/plugin.css">
                
            
                
                <link rel="stylesheet" href="../gitbook/gitbook-plugin-chapter-fold/chapter-fold.css">
                
            
                
                <link rel="stylesheet" href="../gitbook/gitbook-plugin-back-to-top-button/plugin.css">
                
            
                
                <link rel="stylesheet" href="../gitbook/gitbook-plugin-code/plugin.css">
                
            
                
                <link rel="stylesheet" href="../gitbook/gitbook-plugin-highlight/website.css">
                
            
                
                <link rel="stylesheet" href="../gitbook/gitbook-plugin-search/search.css">
                
            
                
                <link rel="stylesheet" href="../gitbook/gitbook-plugin-fontsettings/website.css">
                
            
        

    

    
        
    
        
    
        
    
        
    
        
    
        
    

        
    
    
    <meta name="HandheldFriendly" content="true"/>
    <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
    <meta name="apple-mobile-web-app-capable" content="yes">
    <meta name="apple-mobile-web-app-status-bar-style" content="black">
    <link rel="apple-touch-icon-precomposed" sizes="152x152" href="../gitbook/images/apple-touch-icon-precomposed-152.png">
    <link rel="shortcut icon" href="../gitbook/images/favicon.ico" type="image/x-icon">

    
    <link rel="next" href="正则表达式.html" />
    
    
    <link rel="prev" href="Proxy.html" />
    

    </head>
    <body>
        
<div class="book">
    <div class="book-summary">
        
            
<div id="book-search-input" role="search">
    <input type="text" placeholder="输入并搜索" />
</div>

            
                <nav role="navigation">
                


<ul class="summary">
    
    

    

    
        
        
    
        <li class="chapter " data-level="1.1" data-path="../">
            
                <a href="../">
            
                    
                    Introduction
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.2" data-path="基础.html">
            
                <a href="基础.html">
            
                    
                    基础
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.2.1" data-path="变量.html">
            
                <a href="变量.html">
            
                    
                    数据类型
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.2.2" data-path="let和const命令.html">
            
                <a href="let和const命令.html">
            
                    
                    let和const命令
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.2.3" data-path="数值.html">
            
                <a href="数值.html">
            
                    
                    数值
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.2.4" data-path="字符串.html">
            
                <a href="字符串.html">
            
                    
                    字符串
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.2.5" data-path="对象.html">
            
                <a href="对象.html">
            
                    
                    对象
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.2.6" data-path="数组.html">
            
                <a href="数组.html">
            
                    
                    数组
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.2.7" data-path="Symbol.html">
            
                <a href="Symbol.html">
            
                    
                    Symbol
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.2.8" data-path="函数.html">
            
                <a href="函数.html">
            
                    
                    函数
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.2.8.1" data-path="函数的扩展.html">
            
                <a href="函数的扩展.html">
            
                    
                    函数的扩展
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.2.8.2" data-path="变量的解构赋值.html">
            
                <a href="变量的解构赋值.html">
            
                    
                    变量作用域与解构赋值
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.2.8.3" data-path="函数3.html">
            
                <a href="函数3.html">
            
                    
                    方法函数
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.2.8.4" data-path="高阶函数.html">
            
                <a href="高阶函数.html">
            
                    
                    高阶函数
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.2.8.4.1" data-path="map-reduce.html">
            
                <a href="map-reduce.html">
            
                    
                    map/reduce
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.2.8.4.2" data-path="filter.html">
            
                <a href="filter.html">
            
                    
                    filter
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.2.8.4.3" data-path="sort.html">
            
                <a href="sort.html">
            
                    
                    sort
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.2.8.4.4" data-path="array其他方法.html">
            
                <a href="array其他方法.html">
            
                    
                    array其他方法
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.2.8.5" data-path="闭包.html">
            
                <a href="闭包.html">
            
                    
                    闭包
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.2.8.6" data-path="箭头函数.html">
            
                <a href="箭头函数.html">
            
                    
                    箭头函数
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.2.8.7" data-path="../浏览器/Promise.html">
            
                <a href="../浏览器/Promise.html">
            
                    
                    Promise
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.2.8.8" data-path="generator.html">
            
                <a href="generator.html">
            
                    
                    generator
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.2.8.9" data-path="async.html">
            
                <a href="async.html">
            
                    
                    async
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.2.9" data-path="标准对象.html">
            
                <a href="标准对象.html">
            
                    
                    标准对象
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.2.9.1" data-path="SetMap.html">
            
                <a href="SetMap.html">
            
                    
                    Set,Map
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.2.9.2" data-path="Date.html">
            
                <a href="Date.html">
            
                    
                    Date
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.2.9.3" data-path="Math.html">
            
                <a href="Math.html">
            
                    
                    Math
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.2.9.4" data-path="Proxy.html">
            
                <a href="Proxy.html">
            
                    
                    Proxy
            
                </a>
            

            
        </li>
    
        <li class="chapter active" data-level="1.2.9.5" data-path="RepExp.html">
            
                <a href="RepExp.html">
            
                    
                    正则表达式
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.2.9.6" data-path="正则表达式.html">
            
                <a href="正则表达式.html">
            
                    
                    正则表达式别篇
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.2.9.7" data-path="json.html">
            
                <a href="json.html">
            
                    
                    JSON
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.2.10" data-path="面向对象编程.html">
            
                <a href="面向对象编程.html">
            
                    
                    面向对象编程
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.2.10.1" data-path="对象的扩展.html">
            
                <a href="对象的扩展.html">
            
                    
                    对象的扩展
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.2.10.2" data-path="创建对象.html">
            
                <a href="创建对象.html">
            
                    
                    创建对象
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.2.10.3" data-path="原型继承.html">
            
                <a href="原型继承.html">
            
                    
                    原型继承
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.2.10.4" data-path="class继承.html">
            
                <a href="class继承.html">
            
                    
                    class继承
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.2.10.5" data-path="模块化Module.html">
            
                <a href="模块化Module.html">
            
                    
                    模块化Module
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.2.11" data-path="异常处理.html">
            
                <a href="异常处理.html">
            
                    
                    异常处理
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.2.12" data-path="编程风格.html">
            
                <a href="编程风格.html">
            
                    
                    编程风格
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.3" data-path="../js扩展/js扩展.html">
            
                <a href="../js扩展/js扩展.html">
            
                    
                    js 扩展
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.3.1" data-path="../js扩展/字符串.html">
            
                <a href="../js扩展/字符串.html">
            
                    
                    字符串
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.4" data-path="../浏览器/浏览器.html">
            
                <a href="../浏览器/浏览器.html">
            
                    
                    浏览器
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.4.1" data-path="../浏览器/浏览器对象.html">
            
                <a href="../浏览器/浏览器对象.html">
            
                    
                    浏览器对象
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.4.2" data-path="../浏览器/操作DOM.html">
            
                <a href="../浏览器/操作DOM.html">
            
                    
                    操作DOM
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.4.2.1" data-path="../浏览器/更新DOM.html">
            
                <a href="../浏览器/更新DOM.html">
            
                    
                    更新DOM
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.4.2.2" data-path="../浏览器/插入DOM.html">
            
                <a href="../浏览器/插入DOM.html">
            
                    
                    插入DOM
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.4.2.3" data-path="../浏览器/删除DOM.html">
            
                <a href="../浏览器/删除DOM.html">
            
                    
                    删除DOM
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.4.3" data-path="../浏览器/DOM事件.html">
            
                <a href="../浏览器/DOM事件.html">
            
                    
                    DOM事件
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.4.4" data-path="../浏览器/操作表单.html">
            
                <a href="../浏览器/操作表单.html">
            
                    
                    操作表单
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.4.5" data-path="../浏览器/操作文件.html">
            
                <a href="../浏览器/操作文件.html">
            
                    
                    操作文件
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.4.6" data-path="../浏览器/AJAX.html">
            
                <a href="../浏览器/AJAX.html">
            
                    
                    AJAX
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.4.7" data-path="../浏览器/Canvas.html">
            
                <a href="../浏览器/Canvas.html">
            
                    
                    Canvas
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.5" data-path="../Jquery/jquery.html">
            
                <a href="../Jquery/jquery.html">
            
                    
                    Jquery
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.5.1" data-path="../Jquery/选择器.html">
            
                <a href="../Jquery/选择器.html">
            
                    
                    选择器
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.5.1.1" data-path="../Jquery/层级选择器.html">
            
                <a href="../Jquery/层级选择器.html">
            
                    
                    层级选择器
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.5.1.2" data-path="../Jquery/查找和过滤.html">
            
                <a href="../Jquery/查找和过滤.html">
            
                    
                    查找和过滤
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.5.2" data-path="../Jquery/操作DOM.html">
            
                <a href="../Jquery/操作DOM.html">
            
                    
                    操作DOM
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.5.2.1" data-path="../Jquery/修改DOM结构.html">
            
                <a href="../Jquery/修改DOM结构.html">
            
                    
                    修改DOM结构
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.5.3" data-path="../Jquery/事件.html">
            
                <a href="../Jquery/事件.html">
            
                    
                    事件
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.5.4" data-path="../Jquery/动画.html">
            
                <a href="../Jquery/动画.html">
            
                    
                    动画
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.5.5" data-path="../Jquery/AJAX.html">
            
                <a href="../Jquery/AJAX.html">
            
                    
                    AJAX
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.5.6" data-path="../Jquery/扩展.html">
            
                <a href="../Jquery/扩展.html">
            
                    
                    扩展
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.6" data-path="../nodejs/nodejs.html">
            
                <a href="../nodejs/nodejs.html">
            
                    
                    Nodejs
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.6.1" data-path="../nodejs/模块.html">
            
                <a href="../nodejs/模块.html">
            
                    
                    模块
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.2" data-path="../nodejs/path.html">
            
                <a href="../nodejs/path.html">
            
                    
                    path
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.3" data-path="../nodejs/文件操作.html">
            
                <a href="../nodejs/文件操作.html">
            
                    
                    文件操作 fs
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.4" data-path="../nodejs/流Stream.html">
            
                <a href="../nodejs/流Stream.html">
            
                    
                    流Stream
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.5" data-path="../nodejs/zlib压缩解压缩.html">
            
                <a href="../nodejs/zlib压缩解压缩.html">
            
                    
                    zlib压缩解压缩
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.6" data-path="../nodejs/net网络.html">
            
                <a href="../nodejs/net网络.html">
            
                    
                    net网络
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.7" data-path="../nodejs/http.html">
            
                <a href="../nodejs/http.html">
            
                    
                    http
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.8" data-path="../nodejs/express框架.html">
            
                <a href="../nodejs/express框架.html">
            
                    
                    express框架
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.9" data-path="../nodejs/process进程.html">
            
                <a href="../nodejs/process进程.html">
            
                    
                    process 进程
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.10" data-path="../nodejs/child_process.html">
            
                <a href="../nodejs/child_process.html">
            
                    
                    child_process
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.6.11" data-path="../nodejs/os.html">
            
                <a href="../nodejs/os.html">
            
                    
                    os-操作系统
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.7" data-path="../react/react.html">
            
                <a href="../react/react.html">
            
                    
                    React
            
                </a>
            

            
        </li>
    

    

    <li class="divider"></li>

    <li>
        <a href="https://www.gitbook.com" target="blank" class="gitbook-link">
            本书使用 GitBook 发布
        </a>
    </li>
</ul>


                </nav>
            
        
    </div>

    <div class="book-body">
        
            <div class="body-inner">
                
                    

<div class="book-header" role="navigation">
    

    <!-- Title -->
    <h1>
        <i class="fa fa-circle-o-notch fa-spin"></i>
        <a href=".." >正则表达式</a>
    </h1>
</div>




                    <div class="page-wrapper" tabindex="-1" role="main">
                        <div class="page-inner">
                            
<div id="book-search-results">
    <div class="search-noresults">
    
                                <section class="normal markdown-section">
                                
                                <h1 id="&#x6B63;&#x5219;&#x8868;&#x8FBE;&#x5F0F;">&#x6B63;&#x5219;&#x8868;&#x8FBE;&#x5F0F;</h1>
<p>JS &#x7684;&#x6B63;&#x5219;&#x8868;&#x8FBE;&#x5F0F;&#x8DDF; Java &#x7684;&#x6B63;&#x5219;&#x8868;&#x8FBE;&#x5F0F;&#x7C7B;&#x4F3C;&#x3002;</p>
<p>&#x7528;<code>\d</code>&#x53EF;&#x4EE5;&#x5339;&#x914D;&#x4E00;&#x4E2A;&#x6570;&#x5B57;&#xFF0C;<code>\w</code>&#x53EF;&#x4EE5;&#x5339;&#x914D;&#x4E00;&#x4E2A;&#x5B57;&#x6BCD;&#x6216;&#x6570;&#x5B57;, <code>.</code>&#x53EF;&#x4EE5;&#x5339;&#x914D;&#x4EFB;&#x610F;&#x4E00;&#x4E2A;&#x5B57;&#x7B26;&#x3002;</p>
<p>&#x8981;&#x5339;&#x914D;&#x53D8;&#x957F;&#x7684;&#x5B57;&#x7B26;&#xFF0C;&#x5728;&#x6B63;&#x5219;&#x8868;&#x8FBE;&#x5F0F;&#x4E2D;&#xFF0C;&#x7528;<code>*</code>&#x8868;&#x793A;&#x4EFB;&#x610F;&#x4E2A;&#x5B57;&#x7B26;&#xFF08;&#x5305;&#x62EC;0&#x4E2A;&#xFF09;&#xFF0C;&#x7528;<code>+</code>&#x8868;&#x793A;&#x81F3;&#x5C11;&#x4E00;&#x4E2A;&#x5B57;&#x7B26;&#xFF0C;&#x7528;<code>?</code>&#x8868;&#x793A;0&#x4E2A;&#x6216;1&#x4E2A;&#x5B57;&#x7B26;&#xFF0C;&#x7528;<code>{n}</code>&#x8868;&#x793A;n&#x4E2A;&#x5B57;&#x7B26;&#xFF0C;&#x7528;<code>{n,m}</code>&#x8868;&#x793A;n-m&#x4E2A;&#x5B57;&#x7B26;&#x3002;</p>
<p><code>\s</code> &#x53EF;&#x4EE5;&#x5339;&#x914D;&#x4E00;&#x4E2A;&#x7A7A;&#x683C;&#xFF08;&#x5305;&#x62EC;Tab&#x7B49;&#x7A7A;&#x767D;&#x7B26;&#xFF09;&#x3002;</p>
<p>&#x8981;&#x505A;&#x66F4;&#x7CBE;&#x786E;&#x5730;&#x5339;&#x914D;&#xFF0C;&#x53EF;&#x4EE5;&#x7528;<code>[]</code>&#x8868;&#x793A;&#x8303;&#x56F4;&#xFF0C;&#x6BD4;&#x5982;&#xFF1A;</p>
<ul>
<li><code>[0-9a-zA-Z\_]</code>&#x53EF;&#x4EE5;&#x5339;&#x914D;&#x4E00;&#x4E2A;&#x6570;&#x5B57;&#x3001;&#x5B57;&#x6BCD;&#x6216;&#x8005;&#x4E0B;&#x5212;&#x7EBF;&#xFF1B;</li>
<li><code>[0-9a-zA-Z\_]+</code>&#x53EF;&#x4EE5;&#x5339;&#x914D;&#x81F3;&#x5C11;&#x7531;&#x4E00;&#x4E2A;&#x6570;&#x5B57;&#x3001;&#x5B57;&#x6BCD;&#x6216;&#x8005;&#x4E0B;&#x5212;&#x7EBF;&#x7EC4;&#x6210;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#xFF0C;&#x6BD4;&#x5982;<code>&apos;a100&apos;</code>&#xFF0C;<code>&apos;0_Z&apos;</code>&#xFF0C;<code>&apos;js2015&apos;</code>&#x7B49;&#x7B49;&#xFF1B;</li>
<li><code>[a-zA-Z\_\$][0-9a-zA-Z\_\$]*</code>&#x53EF;&#x4EE5;&#x5339;&#x914D;&#x7531;&#x5B57;&#x6BCD;&#x6216;&#x4E0B;&#x5212;&#x7EBF;&#x3001;$&#x5F00;&#x5934;&#xFF0C;&#x540E;&#x63A5;&#x4EFB;&#x610F;&#x4E2A;&#x7531;&#x4E00;&#x4E2A;&#x6570;&#x5B57;&#x3001;&#x5B57;&#x6BCD;&#x6216;&#x8005;&#x4E0B;&#x5212;&#x7EBF;&#x3001;$&#x7EC4;&#x6210;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#xFF0C;&#x4E5F;&#x5C31;&#x662F;JavaScript&#x5141;&#x8BB8;&#x7684;&#x53D8;&#x91CF;&#x540D;&#xFF1B;</li>
<li><code>[a-zA-Z\_\$][0-9a-zA-Z\_\$]{0, 19}</code>&#x66F4;&#x7CBE;&#x786E;&#x5730;&#x9650;&#x5236;&#x4E86;&#x53D8;&#x91CF;&#x7684;&#x957F;&#x5EA6;&#x662F;1-20&#x4E2A;&#x5B57;&#x7B26;&#xFF08;&#x524D;&#x9762;1&#x4E2A;&#x5B57;&#x7B26;+&#x540E;&#x9762;&#x6700;&#x591A;19&#x4E2A;&#x5B57;&#x7B26;&#xFF09;&#x3002;</li>
</ul>
<p><code>A|B</code>&#x53EF;&#x4EE5;&#x5339;&#x914D;A&#x6216;B&#xFF0C;&#x6240;&#x4EE5;<code>(J|j)ava(S|s)cript</code>&#x53EF;&#x4EE5;&#x5339;&#x914D;<code>&apos;JavaScript&apos;</code>&#x3001;<code>&apos;Javascript&apos;</code>&#x3001;<code>&apos;javaScript&apos;</code>&#x6216;&#x8005;<code>&apos;javascript&apos;</code>&#x3002;</p>
<p><code>^</code>&#x8868;&#x793A;&#x884C;&#x7684;&#x5F00;&#x5934;&#xFF0C;<code>^\d</code>&#x8868;&#x793A;&#x5FC5;&#x987B;&#x4EE5;&#x6570;&#x5B57;&#x5F00;&#x5934;&#x3002;</p>
<p><code>$</code>&#x8868;&#x793A;&#x884C;&#x7684;&#x7ED3;&#x675F;&#xFF0C;<code>\d$</code>&#x8868;&#x793A;&#x5FC5;&#x987B;&#x4EE5;&#x6570;&#x5B57;&#x7ED3;&#x675F;&#x3002;</p>
<p>&#x4F60;&#x53EF;&#x80FD;&#x6CE8;&#x610F;&#x5230;&#x4E86;&#xFF0C;<code>js</code>&#x4E5F;&#x53EF;&#x4EE5;&#x5339;&#x914D;<code>&apos;jsp&apos;</code>&#xFF0C;&#x4F46;&#x662F;&#x52A0;&#x4E0A;<code>^js$</code>&#x5C31;&#x53D8;&#x6210;&#x4E86;&#x6574;&#x884C;&#x5339;&#x914D;&#xFF0C;&#x5C31;&#x53EA;&#x80FD;&#x5339;&#x914D;<code>&apos;js&apos;</code>&#x4E86;&#x3002;&#x6574;&#x884C;&#x5339;&#x914D;&#x5C31;&#x662F;&#x8981;&#x5168;&#x90E8;&#x5339;&#x914D;&#xFF0C;&#x4E0D;&#x80FD;&#x591A;&#x4E5F;&#x4E0D;&#x80FD;&#x5C11;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">const</span> js = <span class="hljs-regexp">/^js$/</span>;
<span class="hljs-built_in">console</span>.log(js.test(<span class="hljs-string">&quot;jss&quot;</span>)); <span class="hljs-comment">// false</span>
</code></pre>
<h3 id="&#x5207;&#x5206;&#x5B57;&#x7B26;&#x4E32;">&#x5207;&#x5206;&#x5B57;&#x7B26;&#x4E32;</h3>
<p>&#x7528;&#x6B63;&#x5219;&#x8868;&#x8FBE;&#x5F0F;&#x5207;&#x5206;&#x5B57;&#x7B26;&#x4E32;&#x6BD4;&#x7528;&#x56FA;&#x5B9A;&#x7684;&#x5B57;&#x7B26;&#x66F4;&#x7075;&#x6D3B;&#xFF0C;&#x8BF7;&#x770B;&#x6B63;&#x5E38;&#x7684;&#x5207;&#x5206;&#x4EE3;&#x7801;&#xFF1A;</p>
<pre><code class="lang-javascript"><span class="hljs-string">&apos;a b   c&apos;</span>.split(<span class="hljs-string">&apos; &apos;</span>); <span class="hljs-comment">// [&apos;a&apos;, &apos;b&apos;, &apos;&apos;, &apos;&apos;, &apos;c&apos;]</span>
</code></pre>
<p>&#x55EF;&#xFF0C;&#x65E0;&#x6CD5;&#x8BC6;&#x522B;&#x8FDE;&#x7EED;&#x7684;&#x7A7A;&#x683C;&#xFF0C;&#x7528;&#x6B63;&#x5219;&#x8868;&#x8FBE;&#x5F0F;&#x8BD5;&#x8BD5;&#xFF1A;</p>
<pre><code class="lang-javascript"><span class="hljs-string">&apos;a b   c&apos;</span>.split(<span class="hljs-regexp">/\s+/</span>); <span class="hljs-comment">// [&apos;a&apos;, &apos;b&apos;, &apos;c&apos;]</span>
</code></pre>
<p>&#x65E0;&#x8BBA;&#x591A;&#x5C11;&#x4E2A;&#x7A7A;&#x683C;&#x90FD;&#x53EF;&#x4EE5;&#x6B63;&#x5E38;&#x5206;&#x5272;&#x3002;&#x52A0;&#x5165;<code>,</code>&#x8BD5;&#x8BD5;&#xFF1A;</p>
<pre><code class="lang-javascript"><span class="hljs-string">&apos;a,b, c  d&apos;</span>.split(<span class="hljs-regexp">/[\s\,]+/</span>); <span class="hljs-comment">// [&apos;a&apos;, &apos;b&apos;, &apos;c&apos;, &apos;d&apos;]</span>
</code></pre>
<p>&#x518D;&#x52A0;&#x5165;<code>;</code>&#x8BD5;&#x8BD5;&#xFF1A;</p>
<pre><code class="lang-javascript"><span class="hljs-string">&apos;a,b;; c  d&apos;</span>.split(<span class="hljs-regexp">/[\s\,\;]+/</span>); <span class="hljs-comment">// [&apos;a&apos;, &apos;b&apos;, &apos;c&apos;, &apos;d&apos;]</span>
</code></pre>
<p>&#x5982;&#x679C;&#x7528;&#x6237;&#x8F93;&#x5165;&#x4E86;&#x4E00;&#x7EC4;&#x6807;&#x7B7E;&#xFF0C;&#x4E0B;&#x6B21;&#x8BB0;&#x5F97;&#x7528;&#x6B63;&#x5219;&#x8868;&#x8FBE;&#x5F0F;&#x6765;&#x628A;&#x4E0D;&#x89C4;&#x8303;&#x7684;&#x8F93;&#x5165;&#x8F6C;&#x5316;&#x6210;&#x6B63;&#x786E;&#x7684;&#x6570;&#x7EC4;&#x3002;</p>
<h3 id="&#x5206;&#x7EC4;">&#x5206;&#x7EC4;</h3>
<p>&#x9664;&#x4E86;&#x7B80;&#x5355;&#x5730;&#x5224;&#x65AD;&#x662F;&#x5426;&#x5339;&#x914D;&#x4E4B;&#x5916;&#xFF0C;&#x6B63;&#x5219;&#x8868;&#x8FBE;&#x5F0F;&#x8FD8;&#x6709;&#x63D0;&#x53D6;&#x5B50;&#x4E32;&#x7684;&#x5F3A;&#x5927;&#x529F;&#x80FD;&#x3002;&#x7528;<code>()</code>&#x8868;&#x793A;&#x7684;&#x5C31;&#x662F;&#x8981;&#x63D0;&#x53D6;&#x7684;&#x5206;&#x7EC4;&#xFF08;Group&#xFF09;&#x3002;&#x6BD4;&#x5982;&#xFF1A;</p>
<p><code>^(\d{3})-(\d{3,8})$</code>&#x5206;&#x522B;&#x5B9A;&#x4E49;&#x4E86;&#x4E24;&#x4E2A;&#x7EC4;&#xFF0C;&#x53EF;&#x4EE5;&#x76F4;&#x63A5;&#x4ECE;&#x5339;&#x914D;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#x4E2D;&#x63D0;&#x53D6;&#x51FA;&#x533A;&#x53F7;&#x548C;&#x672C;&#x5730;&#x53F7;&#x7801;&#xFF1A;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> re = <span class="hljs-regexp">/^(\d{3})-(\d{3,8})$/</span>;
re.exec(<span class="hljs-string">&apos;010-12345&apos;</span>); <span class="hljs-comment">// [&apos;010-12345&apos;, &apos;010&apos;, &apos;12345&apos;]</span>
re.exec(<span class="hljs-string">&apos;010 12345&apos;</span>); <span class="hljs-comment">// null</span>
</code></pre>
<p>&#x5982;&#x679C;&#x6B63;&#x5219;&#x8868;&#x8FBE;&#x5F0F;&#x4E2D;&#x5B9A;&#x4E49;&#x4E86;&#x7EC4;&#xFF0C;&#x5C31;&#x53EF;&#x4EE5;&#x5728;<code>RegExp</code>&#x5BF9;&#x8C61;&#x4E0A;&#x7528;<code>exec()</code>&#x65B9;&#x6CD5;&#x63D0;&#x53D6;&#x51FA;&#x5B50;&#x4E32;&#x6765;&#x3002;</p>
<p><code>exec()</code>&#x65B9;&#x6CD5;&#x5728;&#x5339;&#x914D;&#x6210;&#x529F;&#x540E;&#xFF0C;&#x4F1A;&#x8FD4;&#x56DE;&#x4E00;&#x4E2A;<code>Array</code>&#xFF0C;&#x7B2C;&#x4E00;&#x4E2A;&#x5143;&#x7D20;&#x662F;&#x6B63;&#x5219;&#x8868;&#x8FBE;&#x5F0F;&#x5339;&#x914D;&#x5230;&#x7684;&#x6574;&#x4E2A;&#x5B57;&#x7B26;&#x4E32;&#xFF0C;&#x540E;&#x9762;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#x8868;&#x793A;&#x5339;&#x914D;&#x6210;&#x529F;&#x7684;&#x5B50;&#x4E32;&#x3002;</p>
<p><code>exec()</code>&#x65B9;&#x6CD5;&#x5728;&#x5339;&#x914D;&#x5931;&#x8D25;&#x65F6;&#x8FD4;&#x56DE;<code>null</code>&#x3002;</p>
<h3 id="&#x8D2A;&#x5A6A;&#x5339;&#x914D;">&#x8D2A;&#x5A6A;&#x5339;&#x914D;</h3>
<p>&#x9700;&#x8981;&#x7279;&#x522B;&#x6307;&#x51FA;&#x7684;&#x662F;&#xFF0C;&#x6B63;&#x5219;&#x5339;&#x914D;&#x9ED8;&#x8BA4;&#x662F;&#x8D2A;&#x5A6A;&#x5339;&#x914D;&#xFF0C;&#x4E5F;&#x5C31;&#x662F;&#x5339;&#x914D;&#x5C3D;&#x53EF;&#x80FD;&#x591A;&#x7684;&#x5B57;&#x7B26;&#x3002;&#x4E3E;&#x4F8B;&#x5982;&#x4E0B;&#xFF0C;&#x5339;&#x914D;&#x51FA;&#x6570;&#x5B57;&#x540E;&#x9762;&#x7684;<code>0</code>&#xFF1A;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> re = <span class="hljs-regexp">/^(\d+)(0*)$/</span>;
re.exec(<span class="hljs-string">&apos;102300&apos;</span>); <span class="hljs-comment">// [&apos;102300&apos;, &apos;102300&apos;, &apos;&apos;]</span>
</code></pre>
<p>&#x7531;&#x4E8E;<code>\d+</code>&#x91C7;&#x7528;&#x8D2A;&#x5A6A;&#x5339;&#x914D;&#xFF0C;&#x76F4;&#x63A5;&#x628A;&#x540E;&#x9762;&#x7684;<code>0</code>&#x5168;&#x90E8;&#x5339;&#x914D;&#x4E86;&#xFF0C;&#x7ED3;&#x679C;<code>0*</code>&#x53EA;&#x80FD;&#x5339;&#x914D;&#x7A7A;&#x5B57;&#x7B26;&#x4E32;&#x4E86;&#x3002;</p>
<p>&#x5FC5;&#x987B;&#x8BA9;<code>\d+</code>&#x91C7;&#x7528;&#x975E;&#x8D2A;&#x5A6A;&#x5339;&#x914D;&#xFF08;&#x4E5F;&#x5C31;&#x662F;&#x5C3D;&#x53EF;&#x80FD;&#x5C11;&#x5339;&#x914D;&#xFF09;&#xFF0C;&#x624D;&#x80FD;&#x628A;&#x540E;&#x9762;&#x7684;<code>0</code>&#x5339;&#x914D;&#x51FA;&#x6765;&#xFF0C;&#x52A0;&#x4E2A;<code>?</code>&#x5C31;&#x53EF;&#x4EE5;&#x8BA9;<code>\d+</code>&#x91C7;&#x7528;&#x975E;&#x8D2A;&#x5A6A;&#x5339;&#x914D;&#xFF1A;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> re = <span class="hljs-regexp">/^(\d+?)(0*)$/</span>;
re.exec(<span class="hljs-string">&apos;102300&apos;</span>); <span class="hljs-comment">// [&apos;102300&apos;, &apos;1023&apos;, &apos;00&apos;]</span>
</code></pre>
<h3 id="&#x5168;&#x5C40;&#x641C;&#x7D22;">&#x5168;&#x5C40;&#x641C;&#x7D22;</h3>
<p>JavaScript&#x7684;&#x6B63;&#x5219;&#x8868;&#x8FBE;&#x5F0F;&#x8FD8;&#x6709;&#x51E0;&#x4E2A;&#x7279;&#x6B8A;&#x7684;&#x6807;&#x5FD7;&#xFF0C;&#x6700;&#x5E38;&#x7528;&#x7684;&#x662F;<code>g</code>&#xFF0C;&#x8868;&#x793A;&#x5168;&#x5C40;&#x5339;&#x914D;&#xFF1A;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> r1 = <span class="hljs-regexp">/test/g</span>;
<span class="hljs-comment">// &#x7B49;&#x4EF7;&#x4E8E;:</span>
<span class="hljs-keyword">var</span> r2 = <span class="hljs-keyword">new</span> <span class="hljs-built_in">RegExp</span>(<span class="hljs-string">&apos;test&apos;</span>, <span class="hljs-string">&apos;g&apos;</span>);
</code></pre>
<p>&#x5168;&#x5C40;&#x5339;&#x914D;&#x53EF;&#x4EE5;&#x591A;&#x6B21;&#x6267;&#x884C;<code>exec()</code>&#x65B9;&#x6CD5;&#x6765;&#x641C;&#x7D22;&#x4E00;&#x4E2A;&#x5339;&#x914D;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#x3002;&#x5F53;&#x6211;&#x4EEC;&#x6307;&#x5B9A;<code>g</code>&#x6807;&#x5FD7;&#x540E;&#xFF0C;&#x6BCF;&#x6B21;&#x8FD0;&#x884C;<code>exec()</code>&#xFF0C;&#x6B63;&#x5219;&#x8868;&#x8FBE;&#x5F0F;&#x672C;&#x8EAB;&#x4F1A;&#x66F4;&#x65B0;<code>lastIndex</code>&#x5C5E;&#x6027;&#xFF0C;&#x8868;&#x793A;&#x4E0A;&#x6B21;&#x5339;&#x914D;&#x5230;&#x7684;&#x6700;&#x540E;&#x7D22;&#x5F15;&#xFF1A;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> s = <span class="hljs-string">&apos;JavaScript, VBScript, JScript and ECMAScript&apos;</span>;
<span class="hljs-keyword">var</span> re=<span class="hljs-regexp">/[a-zA-Z]+Script/g</span>;

<span class="hljs-comment">// &#x4F7F;&#x7528;&#x5168;&#x5C40;&#x5339;&#x914D;:</span>
re.exec(s); <span class="hljs-comment">// [&apos;JavaScript&apos;]</span>
re.lastIndex; <span class="hljs-comment">// 10</span>

re.exec(s); <span class="hljs-comment">// [&apos;VBScript&apos;]</span>
re.lastIndex; <span class="hljs-comment">// 20</span>

re.exec(s); <span class="hljs-comment">// [&apos;JScript&apos;]</span>
re.lastIndex; <span class="hljs-comment">// 29</span>

re.exec(s); <span class="hljs-comment">// [&apos;ECMAScript&apos;]</span>
re.lastIndex; <span class="hljs-comment">// 44</span>

re.exec(s); <span class="hljs-comment">// null&#xFF0C;&#x76F4;&#x5230;&#x7ED3;&#x675F;&#x4ECD;&#x6CA1;&#x6709;&#x5339;&#x914D;&#x5230;</span>
</code></pre>
<p>&#x5168;&#x5C40;&#x5339;&#x914D;&#x7C7B;&#x4F3C;&#x641C;&#x7D22;&#xFF0C;&#x56E0;&#x6B64;&#x4E0D;&#x80FD;&#x4F7F;&#x7528;<code>/^...$/</code>&#xFF0C;&#x90A3;&#x6837;&#x53EA;&#x4F1A;&#x6700;&#x591A;&#x5339;&#x914D;&#x4E00;&#x6B21;&#x3002;</p>
<p>&#x6B63;&#x5219;&#x8868;&#x8FBE;&#x5F0F;&#x8FD8;&#x53EF;&#x4EE5;&#x6307;&#x5B9A;<code>i</code>&#x6807;&#x5FD7;&#xFF0C;&#x8868;&#x793A;&#x5FFD;&#x7565;&#x5927;&#x5C0F;&#x5199;&#xFF0C;<code>m</code>&#x6807;&#x5FD7;&#xFF0C;&#x8868;&#x793A;&#x6267;&#x884C;&#x591A;&#x884C;&#x5339;&#x914D;&#x3002;</p>

                                
                                </section>
                            
    </div>
    <div class="search-results">
        <div class="has-results">
            
            <h1 class="search-results-title"><span class='search-results-count'></span> results matching "<span class='search-query'></span>"</h1>
            <ul class="search-results-list"></ul>
            
        </div>
        <div class="no-results">
            
            <h1 class="search-results-title">No results matching "<span class='search-query'></span>"</h1>
            
        </div>
    </div>
</div>

                        </div>
                    </div>
                
            </div>

            
                
                <a href="Proxy.html" class="navigation navigation-prev " aria-label="Previous page: Proxy">
                    <i class="fa fa-angle-left"></i>
                </a>
                
                
                <a href="正则表达式.html" class="navigation navigation-next " aria-label="Next page: 正则表达式别篇">
                    <i class="fa fa-angle-right"></i>
                </a>
                
            
        
    </div>

    <script>
        var gitbook = gitbook || [];
        gitbook.push(function() {
            gitbook.page.hasChanged({"page":{"title":"正则表达式","level":"1.2.9.5","depth":3,"next":{"title":"正则表达式别篇","level":"1.2.9.6","depth":3,"path":"基础/正则表达式.md","ref":"基础/正则表达式.md","articles":[]},"previous":{"title":"Proxy","level":"1.2.9.4","depth":3,"path":"基础/Proxy.md","ref":"基础/Proxy.md","articles":[]},"dir":"ltr"},"config":{"plugins":["lunr","pageview-count","chapter-fold","back-to-top-button","code","hide-element","-sharing","sharing-plus","custom-favicon"],"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"chapter-fold":{},"search":{},"sharing-plus":{"qq":false,"all":["facebook","google","twitter","instapaper","linkedin","pocket","stumbleupon"],"douban":false,"facebook":true,"weibo":false,"instapaper":false,"whatsapp":false,"hatenaBookmark":false,"twitter":true,"messenger":false,"line":false,"vk":false,"pocket":true,"google":false,"viber":false,"stumbleupon":false,"qzone":false,"linkedin":false},"lunr":{"ignoreSpecialCharacters":false,"maxIndexSize":1000000},"code":{"copyButtons":true},"hide-element":{"elements":[".gitbook-link"]},"fontsettings":{"theme":"white","family":"sans","size":2},"highlight":{},"favicon":"js.ico","back-to-top-button":{},"pageview-count":{},"custom-favicon":{},"sharing":{"qq":true,"all":["douban","facebook","google","instapaper","linkedin","twitter","weibo","messenger","qq","qzone","viber","whatsapp"],"douban":true,"facebook":true,"weibo":true,"twitter":true,"pocket":true,"google":true,"qzone":true},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":false}},"theme":"default","author":"Veng","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"title":"JavaScript学习","language":"zh-hans","gitbook":"*","description":"javaScript的学习笔记"},"file":{"path":"基础/RepExp.md","mtime":"2020-12-10T02:10:04.990Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2020-12-10T03:00:51.663Z"},"basePath":"..","book":{"language":""}});
        });
    </script>
</div>

        
    <script src="../gitbook/gitbook.js"></script>
    <script src="../gitbook/theme.js"></script>
    
        
        <script src="../gitbook/gitbook-plugin-lunr/lunr.min.js"></script>
        
    
        
        <script src="../gitbook/gitbook-plugin-lunr/search-lunr.js"></script>
        
    
        
        <script src="../gitbook/gitbook-plugin-pageview-count/plugin.js"></script>
        
    
        
        <script src="../gitbook/gitbook-plugin-chapter-fold/chapter-fold.js"></script>
        
    
        
        <script src="../gitbook/gitbook-plugin-back-to-top-button/plugin.js"></script>
        
    
        
        <script src="../gitbook/gitbook-plugin-code/plugin.js"></script>
        
    
        
        <script src="../gitbook/gitbook-plugin-hide-element/plugin.js"></script>
        
    
        
        <script src="../gitbook/gitbook-plugin-sharing-plus/buttons.js"></script>
        
    
        
        <script src="../gitbook/gitbook-plugin-search/search-engine.js"></script>
        
    
        
        <script src="../gitbook/gitbook-plugin-search/search.js"></script>
        
    
        
        <script src="../gitbook/gitbook-plugin-fontsettings/fontsettings.js"></script>
        
    

    </body>
</html>

